Orange County has not adopted a mandatory soft-story retrofit ordinance comparable to Los Angeles (Ordinance 183893) or Santa Monica (Ord. 2479CCS). Multi-family wood-frame buildings with tuck-under parking in unincorporated Orange County are governed only by the seismic provisions in the California Existing Building Code (CEBC) Chapter A4 'Earthquake Hazard Reduction for Existing Wood-Frame Residential Buildings' as adopted by the County of Orange Building Code (Codified Ordinances Title 7, Div. 1).
California Existing Building Code Appendix Chapter A4 provides the prescriptive retrofit standard — adding plywood shear walls and steel moment frames at soft-story openings — but it applies only when a city or county affirmatively adopts a mandatory retrofit program. OC Public Works Building Safety enforces CEBC for voluntary retrofits, issuing permits under the County of Orange Codified Ordinances §7-1-30. The County Board of Supervisors has not adopted a mandatory ordinance, so building owners face no compliance deadline. Inside individual OC cities the picture varies: Santa Ana adopted a voluntary screening program in 2018 but has no mandate; Anaheim and Costa Mesa have studied soft-story inventories but enacted no mandate. Owners pursuing voluntary retrofit benefit from CEBC Chapter A4 reduced design forces (75% of standard seismic load), making compliance affordable.
Because no mandatory ordinance exists, owners face no county fines or compliance deadlines specific to soft-story retrofit. Voluntary retrofit permits issued by OC Building Safety must comply with all CEBC Appendix A4 standards or stop-work orders may issue under §7-1-44. If a voluntary retrofit is started without permit, after-the-fact permit fees apply (typically 2× standard fee).
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